08L.Henri 緩慢北上漸轉化

KINGRIC · 2015-9-8 10:47

本帖最後由阿隆於 2015-9-14 00:00 編輯

  熱帶風暴
編號：08 L
名稱：Henri

  基本資料
擾動編號日期：2015 年 09 月 08 日 06 時
命名日期　　：2015 年 09 月 10 日 11 時
消散日期　　：2015 年 09 月 13 日 00 時
登陸地點　　：暫無

  巔峰時期資料
近中心最強風速：35  kt ( TS )
海平面最低氣壓：1008 百帕

  過去路徑圖

  討論帖圖片
92L.INVEST.25kts-1014mb-30.9N-60.9W

NHC:10%

2. A concentrated area of cloudiness and showers has developed over the
central Atlantic about 250 miles east-southeast of Bermuda.
Environmental conditions are expected to become somewhat favorable
for development during the next few days while the system remains
nearly stationary for the next day or so, and then moves northward
at 5 to 10 mph by Wednesday.
* Formation chance through 48 hours...low...10 percent
* Formation chance through 5 days...low...20 percent

以上資料來自：NHC、颱風論壇整理製作

alu · 2015-9-8 20:20

它形成的緯度太高了，我個人認為它應該很快的時間就會消散不見而不是發產起來

t02436 · 2015-9-9 14:16

t02436 · 2015-9-10 11:19

03Z命名Henri
將開始逐漸北上，並在三天之後轉化

ZCZC MIATCDAT3 ALL
TTAA00 KNHC DDHHMM

TROPICAL STORM HENRI DISCUSSION NUMBER 5
NWS NATIONAL HURRICANE CENTER MIAMI FL    AL082015
1100 PM AST WED SEP 09 2015

Recently received ASCAT-B scatterometer data showed an area of 35-40
kt wind vectors in the convection about 75-100 n mi east of the
center. Based on this, the initial intensity is increased to a
possibly conservative 35 kt and the cyclone is upgraded to a
tropical storm. Despite the upgrade, Henri remains a disorganized
system, with the low-level center remaining exposed to the west of
the convection due to 15-20 kt of shear.  In addition, microwave
satellite data and experimental European multispectral satellite
imagery suggest a tongue of dry air is entraining into the cyclone
around the west, south, and southeast sides of the circulation.

Henri has started its expected northward track with the initial
motion of 355/4.  For the next 36-48 hours, the cyclone should move
generally northward with an increase in forward speed between the
subtropical ridge to the east and a deep-layer trough moving
eastward through the eastern United States.  After that time, Henri
should turn northeastward and eastward as it enters the westerlies.
The new forecast track is similar to the previous track, but it lies
a little south of the center of the guidance envelope after 36 hours
due to a northward shift in the guidance.

The dynamical models suggest that the shear should subside during
the next 36-48 hours, and that the dry air entrainment should also
decrease.  This combination should allow Henri to strengthen until
it reaches colder sea surface temperatures north of the Gulf Stream
in a little under 48 hours.  After that, the cyclone is expected to
become extratropical as it merges with a frontal system.  The new
intensity forecast calls for a peak intensity near 50 kt in 36-48
hours, followed by gradual weakening.  The first 48 hours are in
best agreement with the SHIPS model, and the intensities after
extratropical transition are based on input from the NOAA Ocean
Prediction Center.

FORECAST POSITIONS AND MAX WINDS

INIT  10/0300Z 31.3N  60.7W 35 KT  40 MPH
12H  10/1200Z 32.8N  60.9W 40 KT  45 MPH
24H  11/0000Z 35.3N  60.9W 45 KT  50 MPH
36H  11/1200Z 38.6N  60.2W 50 KT  60 MPH
48H  12/0000Z 42.4N  58.0W 50 KT  60 MPH
72H  13/0000Z 47.5N  48.5W 45 KT  50 MPH...POST-TROP/EXTRATROP
96H  14/0000Z 47.5N  32.5W 40 KT  45 MPH...POST-TROP/EXTRATROP
120H  15/0000Z 47.0N  17.0W 35 KT  40 MPH...POST-TROP/EXTRATROP

$$
Forecaster Beven